Abstract
Therapists and the public are becoming increasingly aware that psychotherapy can have side effects. The prevalence varies depending on the patients, treatments, settings, assessment methods and the researched type of side effect. Objective of this study is to assess side effects of routine outpatient psychodynamic and cognitive behaviour therapy. In a cross-sectional study cognitive behaviour therapist (n = 73) and psychodynamic psychotherapists (n = 57) were asked in a semi-structured interview about unwanted events and side effects in reference to their most recent patients (N = 276) using a domain inspection method. Their reports were cross-checked by an expert assessor. Multiple random-intercept models were conducted to investigate the influence of various variables. Therapists reported in 170 patients (61.4%) a total of 468 unwanted events. There was at least one side effect in 33.2% of the cases. Most frequent side effects were “strains in family relations” and “deterioration of symptoms”. Illness severity has a significant influence on the amount of side effects reported. The data confirm that side effects of psychotherapy are frequent. The difference between side effects and unwanted events shows the importance of such a distinction. The reporting of side effects for one in three patients may indicate an under recognition of side effects or reporting of only relevant or disturbing side effects.
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